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Characteristics

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Characteristics
There are a lot of advantages for using diamonds and sapphire, which is the hardest substance as industrial jewel parts. Please compare with other materials using following Physical Properties Chart.

Sapphire
Diamond
Quartz
Density [g/cm3]
3.97
3.515
2.201
Young's Modulus [ GPa ]
470
1,050
70
Knoop Hardness [GPa]
13.4
125
5.95
Melting Point
[ °C ]
2,053
Does not melt
1,600
Linear Expansion
Coefficient [ K-1 ]
Parallel to C axis:
5.3 Χ 10-6
Perpendicular to C axis:
4.5 Χ 10-6
2.3 Χ 10-6
0.59 Χ 10-6
Specic Heat [ J/Kg·K]
760
509
772
Thermal Conductivity
[ W/m·K ]
42.00
2,200.00
1.38
Refractive
Index
1.77 (@589.3nm)
2.41 (@656.3nm)
1.46 (@587.6nm)
     
Single Crystal Sapphire Diamond High Precision Processing Technology
     





 
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